I tried this change with the script:

fromcursesimportwrapperimportctypesdefmain(window):window.nodelay(True)returnwindow.getch()print(wrapper(main))

Before (without this change), it displays-1.

After (with this change), it fails with the exception:_curses.error: wgetch() (called by getch()): no input.

So this change is backward incompatible. Is it deliberate?

Hum. No it's not meant to be broken!

Only the signals should be handled, but otherwise we shouldn't raise an exception.

Now I am bit conflicted. Ideally, we should return -1 for everythingor raise an exception as in the other functions. I don't know why it was historically chosen to return -1 forgetch but not forget_wch in no-delay mode.

However, since I don't want to break stuff, I don't know how we can make a smooth transition, except by raising a warning before returning -1.